Senior Software Engineer - Full Stack

Who we are

SII Group is a trusted technology partner, SII provides high value added solutions for the IT projects of many large corporations. Since its founding in 1979, the Company has been providing solutions adapted to its clients’ needs, by relying on :

> Its acknowledged expertise in various industries and sectors

> Proven 'turnkey'​ solutions

> An efficient quality system

> Adaptable, evolving services

Today, with a staff of more than 18'000, SII Group is supporting companies across 20 countries.

At SII Switzerland we pay attention to the personal and professional wellbeing of our employees. We place our collaborators at the heart of our actions and activities. If you are motivated by the perspective of joining a big, trusted and recognized group, then let's meet !

To develop our consulting offer and support one of our clients, we are looking for a talented Senior Software Engineer - Full Stack.

Missions

• Design, implement, and maintain mission-critical cloud-native solutions on AWS.
• Develop interactive and high-performance UIs for asset management and customer relationships.
• Conduct usability testing to refine interactions and ensure user satisfaction.
• Create advanced data visualizations (D3.js, dashboards, real-time charts).
• Design and optimize scalable, secure RESTful APIs.
• Develop and maintain automated testing suites, including unit, integration, and end-to-end tests.
• Conduct performance testing for APIs and frontend components to ensure scalability and reliability.
• Write clean, efficient, and modular code using HTML, CSS, JavaScript, and various frameworks.
• Optimize backend processes for low-latency, high-volume data delivery to support real-time applications.

Profile

• 7+ years of experience in frontend development with a focus on data-driven UIs and visualization
• Proficiency in JavaScript mandatory (D3.js, Angular, or similar frameworks).
• Backend development experience (Java, Python, Rust)
• Advanced experience in backend API design and development, with a focus on scalability, security and low-latency processing
• Familiarity with CSS frameworks and pro-processors like Sass or LESS
• Experience with frontend framworks like Angular
• Experience in creating real-time, high-performance visualizations with WebSockets and WASM Integration
• Proven ability to design robust test strategies for both frontend components and backend APIs
• Proficiency in RESTful API design and development
• Familiarity with cloud services, especially AWS (e.g., Lambda, API Gateway)
• Proficiency in version control tools like GitLab or GitHub
• Experience with CI/CD pipelines to streamline frontend and API deployments

For information

• Start date : ASAP
• Location : Olten - CH
• Contract : Permanent
• Language : Fluent in English, French is a plus
• European nationality